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iawen
发表于 2009-1-13 17:09
目标软件：XXX文件夹加锁王 2009 9.90 钻石版
工具：OD，VolX大侠的脚本
平台：XP SP3
程序加了强壳，用PEID查壳显示为：ASProtect 2.0x Registered -> Alexey Solodovnikov
再用VerA插件赤查找一下，则显示为：Version: ASProtect 1.32 build 10.20 Beta
怀疑是ASPR的高版本，毕竟VerA已经N久没更新了，呵呵！不过，用VolX大侠的脚本，低版本的也许要手脱，高版的却是一健搞定，呵呵！
用脚本脱过后，OD载入！在输入假码后，通过堆栈调用，很快就找到注册验证的关键点：[separator]004B9388 /$ 55 push ebp
004B9389 |. 8BEC mov ebp,esp
004B938B |. 83C4 F0 add esp,-10
004B938E |. 53 push ebx
004B938F |. 33DB xor ebx,ebx
004B9391 |. 895D F0 mov dword ptr ss:[ebp-10],ebx
…………
004B93C5 |. 8B45 FC mov eax,dword ptr ss:[ebp-4]
004B93C8 |. E8 93B6F4FF call de_folde.00404A60
004B93CD |. 3B43 4C cmp eax,dword ptr ds:[ebx+4C] ; 比较用户名长度，不得大于0x64
004B93D0 |. 7F 19 jg short de_folde.004B93EB ; 大于则跳转将EBX清0，然后直接跳转到段尾
004B93D2 |. 8B45 FC mov eax,dword ptr ss:[ebp-4]
004B93D5 |. E8 86B6F4FF call de_folde.00404A60
004B93DA |. 3B43 50 cmp eax,dword ptr ds:[ebx+50] ; 比较用户名长度，不得小于0x3
004B93DD |. 7C 0C jl short de_folde.004B93EB
004B93DF |. 8B45 08 mov eax,dword ptr ss:[ebp+8]
004B93E2 |. E8 79B6F4FF call de_folde.00404A60
004B93E7 |. 85C0 test eax,eax ; 测试注册码是否为空
004B93E9 |. 75 04 jnz short de_folde.004B93EF
004B93EB |> 33DB xor ebx,ebx
004B93ED |. EB 60 jmp short de_folde.004B944F
………………
004B9405 |. 8D4D F0 lea ecx,dword ptr ss:[ebp-10]
004B9408 |. 8B55 FC mov edx,dword ptr ss:[ebp-4]
004B940B |. 8BC3 mov eax,ebx
004B940D |. E8 BAFBFFFF call de_folde.004B8FCC ; 关键CALL，计算注册码
004B9412 |. 8B45 F0 mov eax,dword ptr ss:[ebp-10]
004B9415 |. 8B55 08 mov edx,dword ptr ss:[ebp+8]
004B9418 |. E8 33F8F4FF call de_folde.00408C50
004B941D |. 85C0 test eax,eax
004B941F |. 74 04 je short de_folde.004B9425
004B9421 |. 33DB xor ebx,ebx
004B9423 |. EB 2A jmp short de_folde.004B944F
………………
004B8FCC /$ 55 push ebp
004B8FCD |. 8BEC mov ebp,esp
004B8FCF |. 83C4 E0 add esp,-20
004B8FD2 |. 53 push ebx
004B8FD3 |. 56 push esi
004B8FD4 |. 57 push edi
004B8FD5 |. 33DB xor ebx,ebx
004B8FD7 |. 895D EC mov dword ptr ss:[ebp-14],ebx
004B9003 |. BA 7C914B00 mov edx,de_folde.004B917C ; ASCII "gf258369gf"
004B9008 |. E8 33B8F4FF call de_folde.00404840 ; 出现一个全局字符
004B900D |. 837D EC 00 cmp dword ptr ss:[ebp-14],0 ; 测试全局字符是否为空
004B9011 |. 75 0D jnz short de_folde.004B9020
004B9028 |. 8BD8 mov ebx,eax ; 取全局字符的长度
004B902A |. 8D45 E8 lea eax,dword ptr ss:[ebp-18]
004B902D |. 50 push eax
004B902E |. 8BCB mov ecx,ebx
004B9030 |. D1F9 sar ecx,1 ; 将全局字符长度/2
004B9032 |. 79 03 jns short de_folde.004B9037
004B9034 |. 83D1 00 adc ecx,0
004B9037 |> BA 01000000 mov edx,1
004B903C |. 8B45 EC mov eax,dword ptr ss:[ebp-14]
004B903F |. E8 74BCF4FF call de_folde.00404CB8
004B9044 |. 8D45 E4 lea eax,dword ptr ss:[ebp-1C]
004B9047 |. 50 push eax
004B9048 |. 8BC3 mov eax,ebx
004B904A |. D1F8 sar eax,1
004B904C |. 79 03 jns short de_folde.004B9051
004B904E |. 83D0 00 adc eax,0
004B9051 |> 8BCB mov ecx,ebx
004B9053 |. 2BC8 sub ecx,eax
004B9055 |. 8BD3 mov edx,ebx
004B9057 |. D1FA sar edx,1
004B9059 |. 79 03 jns short de_folde.004B905E
004B905B |. 83D2 00 adc edx,0
004B905E |> 42 inc edx
004B905F |. 8B45 EC mov eax,dword ptr ss:[ebp-14]
004B9062 |. E8 51BCF4FF call de_folde.00404CB8 ; 以上：将全局字符平均分为2个部分
004B9067 |. FF75 E8 push dword ptr ss:[ebp-18]
004B906A |. FF75 FC push dword ptr ss:[ebp-4]
004B906D |. FF75 E4 push dword ptr ss:[ebp-1C]
004B9070 |. 8D45 E0 lea eax,dword ptr ss:[ebp-20]
004B9073 |. BA 03000000 mov edx,3
004B9078 |. E8 A3BAF4FF call de_folde.00404B20 ; 将用户名居中插入到全局字符串中
004B907D |> C745 F0 0000000>mov dword ptr ss:[ebp-10],0
004B9093 |. 3B46 4C cmp eax,dword ptr ds:[esi+4C]
004B9096 |. 7F 0D jg short de_folde.004B90A5
004B9098 |. 8B45 FC mov eax,dword ptr ss:[ebp-4]
004B909B |. E8 C0B9F4FF call de_folde.00404A60
004B90A0 |. 3B46 50 cmp eax,dword ptr ds:[esi+50]
004B90A3 |. 7D 0C jge short de_folde.004B90B1 ; 再一次测试用户名长度
004B90B9 |. 8BD8 mov ebx,eax ; 取插入后的字符串长度
004B90BB |. EB 37 jmp short de_folde.004B90F4
004B90BD |> 8B46 68 /mov eax,dword ptr ds:[esi+68] ; ？全局常量：777888999（2E5DA4E7）
004B90C0 |. 8B56 6C |mov edx,dword ptr ds:[esi+6C]
004B90C3 |. 0345 F0 |add eax,dword ptr ss:[ebp-10] ; 累加到EAX
004B90C6 |. 1355 F4 |adc edx,dword ptr ss:[ebp-C]
004B90C9 |. 52 |push edx
004B90CA |. 50 |push eax
004B90CB |. 8B45 E0 |mov eax,dword ptr ss:[ebp-20]
004B90CE |. 0FB64418 FF |movzx eax,byte ptr ds:[eax+ebx->; 按位取字符串的字符
004B90D3 |. 50 |push eax
004B90D4 |. B8 59040000 |mov eax,459 ; 常数0x459
004B90D9 |. 5A |pop edx
004B90DA |. 8BCA |mov ecx,edx
004B90DC |. 33D2 |xor edx,edx
004B90DE |. F7F1 |div ecx ; 将常量除以字符
004B90E0 |. 8BC2 |mov eax,edx ; 保留余数
004B90E2 |. 33D2 |xor edx,edx
004B90E4 |. 290424 |sub dword ptr ss:[esp],eax ; 将全局常量减去余数
004B90E7 |. 195424 04 |sbb dword ptr ss:[esp+4],edx
004B90EB |. 58 |pop eax
004B90EC |. 5A |pop edx
004B90ED |. 8945 F0 |mov dword ptr ss:[ebp-10],eax ; 保存到esp-10处（局域变量）
004B90F0 |. 8955 F4 |mov dword ptr ss:[ebp-C],edx
004B90F3 |. 4B |dec ebx
004B90F4 |> 8B45 E0 mov eax,dword ptr ss:[ebp-20]
004B90F7 |. E8 64B9F4FF |call de_folde.00404A60
004B90FC |. 3BD8 |cmp ebx,eax
004B90FE |. 7F 04 |jg short de_folde.004B9104
004B9100 |. 85DB |test ebx,ebx
004B9102 |.^ 7F B9 \jg short de_folde.004B90BD
004B9104 |> 8B5E 60 mov ebx,dword ptr ds:[esi+60]
完整的C++代码如下：#include<stdio.h>
#include<iostream>
using namespace std;
int main()
{
char gstr[]="gf258369gf";
char name[100]={0};
cout<<"Please Enter Your Name:(Not Space,>3)\n";
cin>>name;
char tmpStr[128]={0};
int i=0;
for(i=0;i<5;i++)
tmpStr[i]=gstr[i];
int len=strlen(name);
for(int j=0;j<len;j++,i++)
tmpStr[i]=name[j];
for(int j=5;j<10;j++,i++)
tmpStr[i]=gstr[j];
__int64 nCode=0;
len=strlen(tmpStr);
len--;
while(tmpStr[len]){
nCode+=0x2E5DA4E7;
nCode-=(0x459 % tmpStr[len]);
len--;
}
cout<<"Your RegCode is: ";
cout.width(10);
cout.fill('0');
cout.setf(ios_base::uppercase);
cout<<hex<<nCode<<endl;;
cout<<"Please Enter a Key to Exit…………\n";
getchar();
getchar();
return 0;
}
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发表于 2009-1-15 21:05
